Degradation of organic contaminants in the CoFe2O4/peroxymonosulfate process: The overlooked role of Co(II)-PMS complex
Cobalt ferrite (CoFe2O4) has been widely employed as a catalyst for the activation of peroxymonosulfate (PMS), in which hydroxyl radicals (•OH) and sulfate radicals (SO4•−) are generally recognized as the main reactive species responsible for the degradation of pollutants. In this study, we find tha...
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doaj-45f9a62f710a4e6887a243625985d1fe2021-07-11T04:29:23ZengElsevierChemical Engineering Journal Advances2666-82112021-11-018100143Degradation of organic contaminants in the CoFe2O4/peroxymonosulfate process: The overlooked role of Co(II)-PMS complexXinhong Li0Zihao Zhao1Hongchao Li2Jieshu Qian3Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaJiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaCorresponding author.; Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaJiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaCobalt ferrite (CoFe2O4) has been widely employed as a catalyst for the activation of peroxymonosulfate (PMS), in which hydroxyl radicals (•OH) and sulfate radicals (SO4•−) are generally recognized as the main reactive species responsible for the degradation of pollutants. In this study, we find that both one-electron transfer and oxygen-atom transfer reactions are involved in the CoFe2O4/PMS process, by using methyl phenyl sulfoxide (MPSO) as a chemical probe. Results from radical quenching and electron paramagnetic resonance (EPR) experiments indicate that the free radicals (i.e., •OH and SO4•−) play only a minor role in the degradation of sulfamethoxazole (SMX). A mechanism involving Co(II)-PMS complex both on the surface of CoFe2O4 and in solution as the dominant reactive species is proposed. Furthermore, the degradation performance of SMX under different conditions were investigated to further cognize the Co(II)-PMS complex-mediated oxidation process. This study broadens our understanding of the role of transition metal-based catalysts in the activation of PMS for the degradation of organic pollutants.http://www.sciencedirect.com/science/article/pii/S2666821121000594PeroxymonosulfateAdvanced oxidation processesCobalt ferriteWater treatmentCo(II)-PMS complex complex |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xinhong Li Zihao Zhao Hongchao Li Jieshu Qian |
spellingShingle |
Xinhong Li Zihao Zhao Hongchao Li Jieshu Qian Degradation of organic contaminants in the CoFe2O4/peroxymonosulfate process: The overlooked role of Co(II)-PMS complex Chemical Engineering Journal Advances Peroxymonosulfate Advanced oxidation processes Cobalt ferrite Water treatment Co(II)-PMS complex complex |
author_facet |
Xinhong Li Zihao Zhao Hongchao Li Jieshu Qian |
author_sort |
Xinhong Li |
title |
Degradation of organic contaminants in the CoFe2O4/peroxymonosulfate process: The overlooked role of Co(II)-PMS complex |
title_short |
Degradation of organic contaminants in the CoFe2O4/peroxymonosulfate process: The overlooked role of Co(II)-PMS complex |
title_full |
Degradation of organic contaminants in the CoFe2O4/peroxymonosulfate process: The overlooked role of Co(II)-PMS complex |
title_fullStr |
Degradation of organic contaminants in the CoFe2O4/peroxymonosulfate process: The overlooked role of Co(II)-PMS complex |
title_full_unstemmed |
Degradation of organic contaminants in the CoFe2O4/peroxymonosulfate process: The overlooked role of Co(II)-PMS complex |
title_sort |
degradation of organic contaminants in the cofe2o4/peroxymonosulfate process: the overlooked role of co(ii)-pms complex |
publisher |
Elsevier |
series |
Chemical Engineering Journal Advances |
issn |
2666-8211 |
publishDate |
2021-11-01 |
description |
Cobalt ferrite (CoFe2O4) has been widely employed as a catalyst for the activation of peroxymonosulfate (PMS), in which hydroxyl radicals (•OH) and sulfate radicals (SO4•−) are generally recognized as the main reactive species responsible for the degradation of pollutants. In this study, we find that both one-electron transfer and oxygen-atom transfer reactions are involved in the CoFe2O4/PMS process, by using methyl phenyl sulfoxide (MPSO) as a chemical probe. Results from radical quenching and electron paramagnetic resonance (EPR) experiments indicate that the free radicals (i.e., •OH and SO4•−) play only a minor role in the degradation of sulfamethoxazole (SMX). A mechanism involving Co(II)-PMS complex both on the surface of CoFe2O4 and in solution as the dominant reactive species is proposed. Furthermore, the degradation performance of SMX under different conditions were investigated to further cognize the Co(II)-PMS complex-mediated oxidation process. This study broadens our understanding of the role of transition metal-based catalysts in the activation of PMS for the degradation of organic pollutants. |
topic |
Peroxymonosulfate Advanced oxidation processes Cobalt ferrite Water treatment Co(II)-PMS complex complex |
url |
http://www.sciencedirect.com/science/article/pii/S2666821121000594 |
work_keys_str_mv |
AT xinhongli degradationoforganiccontaminantsinthecofe2o4peroxymonosulfateprocesstheoverlookedroleofcoiipmscomplex AT zihaozhao degradationoforganiccontaminantsinthecofe2o4peroxymonosulfateprocesstheoverlookedroleofcoiipmscomplex AT hongchaoli degradationoforganiccontaminantsinthecofe2o4peroxymonosulfateprocesstheoverlookedroleofcoiipmscomplex AT jieshuqian degradationoforganiccontaminantsinthecofe2o4peroxymonosulfateprocesstheoverlookedroleofcoiipmscomplex |
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